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Treasury Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended
Jan. 21, 2016
Feb. 29, 2016
Sep. 30, 2010
Aug. 31, 2015
Dec. 16, 2015
Jul. 22, 2015
May. 31, 2015
Feb. 28, 2015
Oct. 01, 2009
Equity, Class of Treasury Stock [Line Items]                  
Authorized stock purchase amount     $ 44.0 [1]   $ 200.0       $ 200.0
Common Stock, par value per share (in Dollars per share)   $ 0.01         $ 0.01 $ 0.01  
Treasury stock acquired (in shares)     5,199,699            
Treasury stock acquired (in dollars per sahre)     $ 30.00            
Increase in authorized amount of stock to be repurchased           $ 50.0      
Treasury stock acquired   $ 7.0 $ 156.0 $ 41.1          
Maximum                  
Equity, Class of Treasury Stock [Line Items]                  
Repurchase offer price (in dollars per share) $ 40.00                
Minimum                  
Equity, Class of Treasury Stock [Line Items]                  
Repurchase offer price (in dollars per share) $ 37.00                
Common Stock                  
Equity, Class of Treasury Stock [Line Items]                  
Common Stock, par value per share (in Dollars per share)   $ 0.01              
[1] Represents the remainder of a $200.0 authorization after giving effect to the purchase of 5,199,699 shares at $30.00 per share pursuant to a large share repurchase in the form of a modified Dutch Auction tender offer that was completed by the Company on November 3, 2010 for a total cost of $156.0, excluding related fees and expenses.